Manufacture of brush rigging



Y May 3, 1932.

A. w. PHELPS 1,856,723

MANUFACTURE OF BRUSH RIGGING Filed Dec.

Patented May 3, 1932 UNITED. STATES ALVA w. minus, or manna.

SGN, INDIANA,

PATENT OFFICE) 'nssrenoa mo DELCO-BEEZ coarona'rron,

OF DAYTON, OHIO, A CORPORATION OF DELAWARE MANUFACTURE OF BRUSH BIGGINGApplication filed December 17, 1 928. SerialNo. 326,693.

This invention relates to the manufacture of third br ush rigging for agenerator. H An, ob ect of this invention is to provide, as a newarticle of manufacture, a brush carrying rigging where the metal partsare an- These parts are held chored in a relatively rigid position, but

I not so as to prevent axial movement of the pin and the stud. Themolded phenol condensation product has been sealed around the aperture,in the brush carrying bracket so that it is rigidly anchored in placeand cannot be removed.

* Another'object of this invention is to provide a die having a pan ofapertures, one for stud and the brush carrying the pin and one for thestud and a recess for the brush carryingbracket. This die also has acavity perm tting the phenol condensation product to flow around the endof the pin and the end of the stud and around the aperture in the brushcarrying bracket whereb the phenol condensation product, upon beingheated, may be forced to flow into the cavity, thereby joining the pin,the stud and the bracket together into a unitary brush carryingrigging.-

Another ob'ect of this invention is to join the brush hol ing pin or armand the spring stud into the brush carrying bracket by molding adielectric material such as a phenol condensation product or syntheticresin around these parts at their surfaces of juncture. This isaccomplished by assembling the brush holding arm or pin, the springbracket into recesses provided therefor in a mold or die, the recessesbeing so arranged that the pin or arm, the stud and the bracket areseparated then forcing a phenol condensation product into a cavitprovided therefor inthe die, by means 0 a cooperating die so that thephenol condensation product will flow around the pin, the stud and thebracket in order to hold these parts in an insulated relapin 18 and thei into which tion to each other upon the solidification of the phenolcondensation product. The res'ults of this process are a time, adecrease in the number of parts, a better brush carrying riggin and gFurther objects and advantages of the present invention will be apparentfrom-the following description, reference being had to the accompanyingdrawings wherein a preferred embodiment of one orm of the presentinvention is clearly shown.

I In the drawings:

large saving of g Fig. 1 shows a "plan view of the brush carr m r1 ng.

Fig. 2 i s an end view of the brush carrying rigging.

Fig. 3 is a sectional view taken on the line 3-3 of Fig. 4, and showsthe parts assembled. in the mold previous to the molding operation. 5 I

Fig. 4 is a sectional view taken on the line 4 4 of Fig. 3 previous tothe molding operation.

Fig. 5 is a sectional view, on the line 55 of Fig. 6.

Fig, 6 is a sectional view taken on the line 6-6 of Fig. 5.

. Referring to the drawings, the reference character -10 indicates thesupporting member, such as a metallic brush carrying bracket, which hasan aperture 12 through which the armature shaft (not shown) aperture 14on passes. It also has an oblong which is molded a unit of insulatingmaterial 16 supporting the brush carrying arm or spring stud or pin 20.The brush carrying pin 18 and the stud 20 have annular recesses 22' and24: respect vely which prevent axial movement of'the pm 18 and stud 20after the recesses have been filled with an insulating material and thishas solidified, anchoring t eparts in a relatively rigid position.- Adie or mold 26 has a recess 28.1nto which fits the brush carryingbracket 10. It also has a pair of apertures or recesses 30 and 32 areinserted the pin 18 and the stud 20, respectively. In Figs. 3 to 6inclusive, it may be clearly seen that the upper surface ofthe brushcarrying bracket 10 is "die 26 and method, is neat in .appearancecheaper.

a brush carrying flush with the upper surface 34 0f the die 26. Asuitable insulating material for this purpose has been found to be aphenol condensation product or a suitable synthetic resin which changesits physical state from a solid to a plastic upon the application ofheat and pressure and solidifies upon being cooled.

In the die 26 and surrounding a portion of the pin 18 and stud 20 andthe aperture 14 is a cavity 36 provided to receive the phenolcondensation product so as to anchor and insulate from each other thepin 18, stud 20 and brush carrying bracket 10. A pellet, or pre-formedblock of molding compound 38 made from phenol resin, is placed over thecavity 36 by the operator. The pellet is forced by the die-member 40into the cavity 36, the dies 26 and 40 being heated by suitable meansnot disclosed and pressure applied to member 40 so as to force thisplastic composition to flow into the cavity 36, filling all partsthereof as indicated by the refer ence character 42 in Figs. 5 and 6.The die may be held in this position a predetermined interval of time,permitting this plastic composition to set or undergo a change from aplastic to a hard rigid insulating composi tion. The dies assembledbrush from the die 26 and is now ready for use. The cooling of the brushrigging may take placebefore or after removal from the die, or bothbefore and after. The parts used for a second rigging are then assembledin the the process repeated.

From the above it may be clearly seen that all riveting, all insulatingwashers and all tubular insulating members are eliminated themanufacture of this is far suy the old and is far are then separated andthe per1or"*to the one produced While the form of embodiment of thepresent invention as herein disclosed, constitutes a preferred form, itis to be understood that other forms might be adopted, all coming withinthe scope of the claims which follow.

What is claimed is as follows:

1. A brush carrying rigging for a third brush e a brush carrying brackethavin tures, anchoring means anchored said apertures, a pin) with anannularrecess embeddedin the anchor,-a stud having an annular recessembedded whereby the bracket, the pin and the stud are held in 'arelatively rigid position.

two aper- 2. A brush carrying rigging for a third comprising incombination,

brush generator,

bracket having'an aperture, a unit of insulatingmeans anchored in saidaperture, a-pin embedded in said unit for carrying rigging is removed inone of.

into the anchor,

In testimon signature.

nerator, comprising in combination,

y whereof I hereto afiix my ALVA W. PHELPS.

